Average rates for 30-year fixed mortgages fell this week, matching a record low set last spring and more than a full percentage point below what they were a year ago, Freddie Mac said Wednesday.

Rates for 30-year mortgages averaged 4.78 percent this week, down from 4.83 percent last week and equaling the record low reached the week of April 30.

Freddie Mac has been tracking rates on 30-year fixed mortgages since 1971. Last year at this time, the 30-year fixed rate mortgage averaged 5.97 percent.